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题名: Low-temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(Leu)SO4 center dot 1/2H(2)O(s) (Leu = L-alpha-leucine)
作者: Di, YY;  Tan, ZC;  Li, LW;  Gao, SL;  Xing, J;  Wang, SX;  Sun, LX
刊名: JOURNAL OF CHEMICAL AND ENGINEERING DATA
发表日期: 2005-09-01
DOI: 10.1021/je0505106f
卷: 50, 期:5, 页:1641-1645
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Multidisciplinary ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Low-temperature heat capacities of the solid coordination compound Zn(Leu)SO(4)center dot 1/2H(2)O(s) were measured by a precision automated adiabatic calorimeter over the temperature range between T = 78 K and T = 371 K. The initial dehydration temperature of the coordination compound was determined to be T-D = 326.50 K by analysis of the heat-capacity curve. The experimental values of molar heat capacities were fitted to a polynomial equation of heat capacities (C-p,C-m) with the reduced temperatures (x), [x = f (T)] by least-squares method. Enthalpies of dissolution of the [ZnSO(4)center dot 7H(2)O(s) + Leu(s)] ( Delta(sol)H degrees(m,1)) and the Zn(Leu)SO(4)center dot 1/2H(2)O(s) (Delta(sol)H degrees(m,2)) in 100.00 mL of 2 mol center dot dm(-3) HCl(aq) at T = 298.15 K were determined to be Delta solH degrees(m,1) = -(85.80 +/- 0.09) kJ center dot mol(-1) and Delta solH(m,2) = (55.97 +/- 0.06) kJ center dot mol(-1) by means of a homemade isoperibol solution-reaction calorimeter. The standard molar enthalpy of formation of the compound was determined as Delta H degrees(m)(Zn(Leu)SO(4)center dot 1/2H(2)O, s, 298.15 K) = -(1999.0 +/- 0.9) kJ center dot mol(-1) from the enthalpies of dissolution and other auxiliary thermodynamic data through a Hess thermochemical cycle. Furthermore, the reliability of the Hess thermochemical cycle was verified by comparing UV/Vis spectra and the refractive indexes of solution A (from dissolution of the [ZnSO(4)center dot 7H(2)O(s) + Leu(s)] mixture in 2 mol center dot dm(-3) hydrochloric acid) and solution A' (from dissolution of the complex Zn(Leu)SO(4)center dot 1/2H(2)O(S) in 2 mol center dot dm(-3) hydrochloric acid).
关键词[WOS]: CALORIMETER
语种: 英语
WOS记录号: WOS:000231863700029
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139778
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Liaocheng Univ, Coll Chem & Chem Engn, Liaocheng 252059, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
3.NW Univ Xian, Dept Chem, Xian 710069, Peoples R China

Recommended Citation:
Di, YY,Tan, ZC,Li, LW,et al. Low-temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(Leu)SO4 center dot 1/2H(2)O(s) (Leu = L-alpha-leucine)[J]. JOURNAL OF CHEMICAL AND ENGINEERING DATA,2005,50(5):1641-1645.
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